REDUCED NUCLEAR MAGNETIC-RELAXATION BY PARAMAGNETIC IMPURITIES IN ONE DIMENSION

The paramagnetic-impurity contribution to NMR relaxation of a diffusing nucleus is shown to be proportional to c2 in one dimension as opposed to c in three dimensions, where c is the impurity concentration. The mechanism is thus not expected to be important for one-dimensional superionic conductors except at high doping levels, whereas it is significant even in nominally pure" three-dimensional superionics. This brings into question the interpretation of recent NMR results in supposedly one-dimensional eucryptite as being due to paramagnetic impurities. © 1979 The American Physical Society."